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-(x-1)=3
We move all terms to the left:
-(x-1)-(3)=0
We get rid of parentheses
-x+1-3=0
We add all the numbers together, and all the variables
-1x-2=0
We move all terms containing x to the left, all other terms to the right
-x=2
x=2/-1
x=-2
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